JP2010121675A - Gate valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gate valve capable of securing excellent sealability, the gate valve being easy to assemble or disassemble/repair, not allowing its valve casing and cover to become bulky by reducing weight, and lengthening the service life of a seal member of the valve casing and the cover. <P>SOLUTION: The cover 5 is formed with a cover cylinder part 5a fitted to the inner peripheral side of an opening cylinder part 2a. An annular projection strip 9 arranged on an outer peripheral surface of the cover cylinder part 5a is locked in the axial direction by a step height part 10 arranged on an inner peripheral surface of the opening cylinder part 2a and a lock ring 11 stored in an annular groove 12. The cover cylinder part 5a is prevented from rotating by fitting a projection part 15 arranged on the outer peripheral surface of the cover cylinder part 5a in an engaging groove 14 arranged on an end surface of the opening cylinder part 2a. A seal ring 17 is installed in a seal groove 16 arranged on the inner peripheral surface of the opening cylinder part 2a. The assembling sand disassembling-repairing are facilitated by sealing between the valve casing 2 and the cover 5, and the valve casing 2 and the cover 5 do not become bulky by reducing weight, and the service life of the seal member of the valve casing 2 and the cover 5 can be lengthened. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gate valve that is used in waterworks and the like and rotates a valve rod inserted through a lid of a valve box to move a valve body in a direction perpendicular to a fluid passage.

  A gate valve such as a water supply is attached to a valve box having an open cylindrical portion that protrudes and opens in a direction perpendicular to the internal fluid passage, and a valve rod that is inserted from the open tubular portion in a direction perpendicular to the fluid passage. A valve body that opens and closes the passage, and a lid that closes the opening cylinder of the valve box and allows the valve stem to be inserted, is used to rotate the valve stem and move the valve body in a direction perpendicular to the fluid passage. ing. Normally, the valve stem is inserted into the lid through the shaft seal member, and the valve body is attached to the nut member screwed into the threaded portion. The valve stem is provided on the valve box by rotating the valve stem with a handle or the like. A valve body guided by the guide portion is moved together with the nut member in a direction perpendicular to the fluid passage. In many cases, the valve box and the lid are formed of a casting or the like, and the valve body has a rubber lining on the surface of the cored bar.

  In such a gate valve, the seal between the opening cylinder part and the lid of the valve box is sealed, and the shaft seal when the valve rod is rotated while the lid that is about to come off from the opening cylinder part by hydraulic pressure is fastened. It is necessary to fix the lid that is about to rotate by friction torque with the member and fix it to the opening cylinder. Conventional general-purpose gate valves are provided with flanges facing each other on the opening cylinder and lid of the valve box, and bolts are inserted into a plurality of bolt holes provided in the circumferential direction of these flanges and tightened with nuts. The lid is prevented from rotating and fixed, and a seal member such as a gasket ring mounted between opposing flanges is clamped to seal between the valve box and the lid (for example, see Patent Document 1).

  The general-purpose gate valve described above has a problem in that it takes time to assemble and disassemble and repair because the lid is fixed by tightening the flanges with numerous bolts and nuts. In addition, there is a problem that a valve box or lid having a flange is heavy and bulky. Furthermore, since the sealing member between the valve box and the lid mounted between the flanges is clamped by a large tightening force by the bolt and nut, the amount of compressive deformation of the sealing member is increased and the life is shortened, and the bolt is tightened. There is a possibility that the pinching pressure becomes non-uniform in the circumferential direction and the sealing performance is lowered.

  For the first problem described above, as shown in FIGS. 13A and 13B, an inward flange 32 is formed in the opening cylinder portion 31 a of the valve box 31, and an outward flange is formed in the lid 33. 34, and the flange 34 is inserted into the opening cylindrical portion 31a, and the foot 35a of the support member 35 fitted on the lid 33 is brought into contact with the upper end surface of the opening cylindrical portion 31a. By tightening the two bolts 36 screwed to the lid 33 through the nut 37, the collar 34 of the lid 33 is pressed against the collar 32 of the opening cylinder portion 31a from the inside to seal between the two collars 32, 34. In addition, there is one in which the lid 33 is prevented from being rotated and fixed to reduce the trouble of assembling and repairing. Although illustration is omitted, the cross-sectional shapes of the opening cylinder portion 31a and the lid 33 are elliptical (see Patent Document 2).

  Further, as shown in FIGS. 14 (a) and 14 (b), the opening cylinder portion 41a and the lid 42 of the valve box 41 are respectively formed with opening portions 43 and 44 projecting to the outer diameter side, and the opening cylinder portion 41a. A plurality of engaging claws 43a projecting outward are provided at equal intervals in the circumferential direction at the mouth portion 43, and a plurality of fitting teeth 44a directed inward at the mouth portion 44 of the lid 42 are equally spaced at the circumferential direction. By providing and rotating the lid 42, the locking claws 43 a are locked in the axial direction by the fitting teeth 44 a, and the lid 42 is prevented from being rotated by the non-rotating pins 45 inserted into the mouth portions 43, 44. Some of them are designed to reduce the labor of assembly and overhaul. Further, the valve box 41 and the lid 42 are sealed with a seal ring 46 mounted between the mouth portions 43 and 44. The seal ring 46 has both or both of the locking claw 43a and the fitting tooth 44a. By tilting the locking surface in the circumferential direction, the lid 42 is rotated so as to be pinched between the mouth portions 43 and 44 (see Patent Document 3).

JP 2000-12087A Japanese Utility Model Publication No. 7-12672 JP-A-11-108211

  The gate valve described in Patent Document 2 can reduce the number of tightening bolts, but since the outer diameter of the outward flange of the lid is larger than the inner diameter of the inner flange of the open cylinder portion, the open cylinder portion If the lid has a circular cross section, the lid can not be inserted into the opening cylinder, and even if it is oval or oval, tilt the heavy lid and insert the lid There is a problem that it is necessary and it takes time to assemble and disassemble.

  Further, the gate valve described in Patent Document 3 can eliminate the need for a tightening bolt, but, like the above-described general-purpose gate valve, is like a flange projecting to the outer diameter side on the opening tube portion and the lid. There is a problem that the valve box and the lid are heavy and bulky because it is necessary to provide a large opening.

  Furthermore, since it is necessary to pinch the sealing member of a valve box and a lid with a strong force in the axial direction in any of those described in Patent Documents 2 and 3, the amount of compressive deformation of the sealing member increases and the service life is increased. In addition to being shortened, there is a possibility that the pinching pressure becomes non-uniform in the circumferential direction and the sealing performance is lowered.

  Accordingly, an object of the present invention is a partition that can be assembled and disassembled easily, the valve box and the lid are light and not bulky, the life of the seal member between the valve box and the lid can be extended, and good sealing performance can be secured. It is to be able to provide a valve.

  In order to solve the above-described problems, the present invention provides a valve box having an open cylindrical portion that protrudes and opens in a direction perpendicular to an internal fluid passage, and a valve rod that is inserted from the open tubular portion in a direction perpendicular to the fluid passage. And a valve body that opens and closes the fluid passage, and a lid that closes the opening cylinder portion of the valve box and allows the valve rod to be inserted therethrough. In a gate valve that moves in a right angle direction, a lid cylinder part that is fitted to the outer peripheral side or inner peripheral side of the opening cylinder part is formed in the lid, and the lid cylinder part that is fitted to the opening cylinder part is axially An axial direction locking means for locking to the circumferential direction and a rotation preventing means for preventing the rotation in the circumferential direction are provided. The structure which provided the sealing member which seals between was employ | adopted.

  That is, an axial direction locking means for forming a lid cylinder part fitted on the outer peripheral side or inner circumference side of the opening cylinder part on the lid and locking the lid cylinder part fitted to the opening cylinder part in the axial direction. And a detent means for preventing rotation in the circumferential direction, and a sealing member for sealing between the valve box and the lid is provided between the peripheral surfaces of the opening cylinder part and the lid cylinder part to be fitted. This eliminates the need for tightening bolts, eliminates the flanges and mouths that project to the outside diameter of the opening cylinder and lid, and eliminates the need to clamp the seal member in the axial direction with a strong force, making assembly and disassembly easy. Thus, it is possible to provide a gate valve that is light and not bulky, can extend the life of the seal member between the valve box and the lid, and can ensure good sealing performance.

  The seal member may be a seal ring that is mounted in an annular seal groove provided on one of the peripheral surfaces of the opening cylinder part and the lid cylinder part to be fitted.

  The axial direction locking means is provided with a protrusion extending in the circumferential direction on the outer peripheral surface of the inner cylindrical portion that is fitted inside of the opening cylindrical portion and the lid cylindrical portion, and the outer side is fitted outside. On the inner peripheral surface of the cylindrical portion, a stepped portion with a widened inlet side that engages the side end surface on the front side in the fitting direction of the protrusion or the tip surface of the inner cylindrical portion is provided, and the inner side of the stepped portion on the inlet side is provided. An annular groove that houses a lock ring that expands and contracts due to elastic deformation is provided on the peripheral surface, and the side end surface on the front side in the fitting direction of the protrusion or the front end surface of the inner cylindrical portion is locked to the stepped portion, The diameter of the lock ring can be reduced to lock the side end surface on the rear side in the fitting direction of the protrusion.

  The axially engaging means is provided with an annular groove for accommodating a lock ring that expands and contracts due to elastic deformation, on an inner peripheral surface of an outer cylindrical portion fitted on the outer side of the opening cylindrical portion and the lid cylindrical portion. An annular engagement groove into which the lock ring is fitted is provided on the outer peripheral surface of the inner cylindrical portion fitted to the inner cylinder, and the diameter of the lock ring housed in the annular groove is reduced to be fitted into the engagement groove. You can also.

  The axial direction locking means is provided with an annular groove on the outer peripheral surface of the inner cylinder part fitted inside the opening cylinder part and the cover cylinder part to accommodate a lock ring that expands and contracts by elastic deformation, and on the outer side. An annular engagement groove into which the lock ring is fitted is provided on the inner peripheral surface of the outer cylindrical portion to be fitted, and the lock ring housed in the annular groove is expanded to be fitted into the engagement groove. You can also.

  The anti-rotation means has a circular cross section of the opening cylinder part and the lid cylinder part to be fitted, and radially extends to an end surface of the outer cylinder part fitted to the outside of the opening cylinder part and the lid cylinder part. At least one engaging groove extending is provided, and an outer peripheral surface of the inner cylindrical portion fitted inside is provided with a protruding portion that protrudes outward and fits into the engaging groove. It can be fitted into the groove.

  The anti-rotation means may have an oval shape or an oval shape that does not allow relative rotation of the cross-sections of the opening cylinder portion and the lid cylinder portion to be fitted.

  Further, the axial locking means has a circular cross section of the opening cylinder part and the lid cylinder part to be fitted, and an outer periphery of an inner cylinder part fitted inside the opening cylinder part and the lid cylinder part. An inward ridge having a notch through which the claw portion is provided on the inner peripheral surface on the inlet side of the outer cylindrical portion fitted on the outer side, and a claw portion protruding to the outer diameter side on the surface, and the notch An arcuate or annular circumferential groove in which the claw portion that passes through is fitted on the back side of the bag is provided, and after the claw portion is passed through the notch, the lid cylinder portion is rotated relative to the opening cylinder portion. Thus, the claw portion can be axially locked to the circumferential groove on the back side of the heel.

  In the case of adopting the axial direction locking means, the rotation preventing means has the circumferential groove in an arc shape, and the side end surface on the front side on which the claw portion is relatively rotated is the end surface of the arc-shaped circumferential groove. The side end surface on the rear surface side of the pressing and at least one claw portion can be locked with a locking member inserted into the circumferential groove.

  By fitting the lid cylinder part on the inner peripheral side of the opening cylinder part, the lid that is attached and detached by disassembly and repair can be made lighter and less bulky.

  In the gate valve of the present invention, a lid cylinder part fitted to the outer peripheral side or inner circumference side of the opening cylinder part is formed on the lid, and the lid cylinder part fitted to the opening cylinder part is locked in the axial direction. An axial direction locking means and a rotation preventing means for preventing rotation in the circumferential direction are provided, and a gap between the valve box and the lid is sealed between the peripheral surfaces of the opening cylinder part and the lid cylinder part to be fitted. Since the seal member is provided, it is easy to assemble and disassemble, the valve box and the lid are light and not bulky, the life of the seal member between the valve box and the lid can be extended, and good sealing performance can be secured. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. As shown in FIG. 1, this gate valve is inserted in a direction perpendicular to the fluid passage 1 from the opening tubular portion 2a and a valve box 2 having an opening tubular portion 2a that projects and opens in a direction perpendicular to the internal fluid passage 1. A valve body 4 that opens and closes the fluid passage 1 and a lid 5 that closes the opening cylinder portion 2a and allows the valve rod 3 to pass therethrough. The valve body 4 attached to the nut member 6 screwed to the thread portion 3a is moved in the direction perpendicular to the fluid passage 1. The valve box 2 and the lid 5 are formed of a casting, and the valve body 4 is a core metal 4a provided with a rubber lining 4b. Although not shown, the valve body 4 is guided to move in a direction perpendicular to the fluid passage 1 by guide grooves of the valve box 2 provided on both sides of the fluid passage 1.

  The lid 5 is formed with a lid cylinder part 5a fitted on the inner peripheral side of the opening cylinder part 2a, and the cross-sections of the opening cylinder part 2a and the lid cylinder part 5a at these fitting parts are as shown in FIG. It is round. Further, the valve stem 3 is inserted into the top portion 5b of the lid 5 through the bush 7 equipped with an O-ring 7a as a shaft seal member, and the valve stem 3 is projected to the upper end portion protruding from the bush presser 8 attached to the top portion 5b. A handle attachment portion 3b is provided for rotating the. In addition, the fitting site | part of the opening cylinder part 2a and the cover cylinder part 5a is formed thickly in order to ensure intensity | strength.

  As shown in FIGS. 2 and 3, the outer peripheral surface of the lid cylinder portion 5 a as the inner cylinder portion fitted inside the opening cylinder portion 2 a has a rectangular cross-section protruding in the circumferential direction and continuously connected in an annular shape. The ridge 9 is provided, and the inlet side is widened so that the ridge 9 is fitted on the inner peripheral surface of the opening cylinder portion 2a as the outer cylinder portion, and the side end surface 9a on the front side in the fitting direction of the ridge 9 is engaged. A stepped portion 10 to be stopped is provided, and an annular groove 12 that houses a lock ring 11 that expands and contracts by elastic deformation is provided on the inner peripheral surface on the inlet side of the stepped portion 10. In addition, the protrusion 9 is good also as what was divided | segmented partially connected in the circumferential direction.

  The lock ring 11 is formed of a circular spring strip that is cut off at one circumferential direction, and is housed in the annular groove 12 with an increased diameter, and the side end surface 9a of the protrusion 9 is locked to the step portion 10. In this state, by pushing the pushing bolt 13 screwed into the bottom of the annular groove 12, the lock ring 11 is reduced in diameter as shown by a one-dot chain line in each drawing, and the fitting direction of the protrusion 9 The side end surface 9b on the rear side is locked. The pushing bolts 13 are provided at three locations at equal intervals in the circumferential direction. Therefore, the cover cylinder part 5a fitted to the opening cylinder part 2a is locked in the axial direction.

  Further, one engagement groove 14 extending in the radial direction is formed on the end surface of the opening cylinder portion 2a by cutting, and the outer peripheral surface of the lid cylinder portion 5a projects to the outer diameter side and fits into the engagement groove 14. A protruding part 15 is provided. Therefore, the cover cylinder part 5a fitted to the opening cylinder part 2a is prevented from rotating. In addition, you may provide the engaging groove 14 and the protrusion part 15 in the multiple places of the circumferential direction.

  Further, an annular seal groove 16 is provided on the inner peripheral surface of the opening cylinder portion 2 a on the back side of the stepped portion 10, and a seal ring 17 is attached to the seal groove 16. The seal ring 17 is of a self-sealing type having a circular cross section, and is pressed against the upper side surface of the seal groove 16 and the outer peripheral surface of the lid tube portion 5a by the water pressure in the valve box 2, and between the valve box 2 and the lid 5 is pressed. Seal. Therefore, the amount of compressive deformation of the seal ring 17 is not as great as that of a seal member that is pinched in the axial direction by bolting or the like, and the durability life is long.

  FIG. 4 shows a modification of the fitting portion between the opening tube portion 2a and the cover tube portion 5a. This modification is different in that the front end surface 5c of the lid cylinder part 5a as the inner cylinder part is locked to the step part 10 of the opening cylinder part 2a. The other parts are the same as those of the first embodiment, and the side end face 9b on the rear side in the fitting direction of the protrusion 9 is locked by the lock ring 11 having a reduced diameter.

  5 (a) and 5 (b) show a modified example of the rotation preventing portion of the lid cylinder portion 5a. In this modified example, the engagement groove 14 into which the protruding portion 15 of the lid cylinder portion 5a is fitted is formed by a pair of radially extending standing wall portions 14a provided on the end surface of the opening cylinder portion 2a. Different.

  6 to 8 show a second embodiment. This gate valve has the same basic configuration as that of the first embodiment. As shown in FIG. 6, the lid cylinder portion 5 a provided on the lid 5 is the inner part of the opening cylinder portion 2 a of the valve box 2. A seal ring 17 that fits on the peripheral side and seals between the valve box 2 and the lid 5 is mounted in a seal groove 16 provided on the inner peripheral surface of the opening cylinder portion 2a.

  In this embodiment, as shown in FIG. 7, the cross-sections of the opening tube portion 2a and the cover tube portion 5a at the fitting portion are elliptical, and the cover tube portion 5a is prevented from rotating, and in FIG. As shown, an annular groove 12a that houses an elliptical lock ring 11a that expands and contracts by elastic deformation is provided on the inner peripheral surface of the opening cylindrical portion 2a, and the lock ring 11a is fitted into the outer peripheral surface of the lid cylindrical portion 5a. The difference is that an annular engagement groove 18 is provided and the lid cylinder portion 5a is locked in the axial direction. The lock ring 11a is cut off at one position of the elliptical short diameter portion and is reduced in diameter. With a tool such as a tool, the distance between the cut portions of the lock ring 11a is widened to expand the lock ring 11a. The lid cylinder portion 5 a is fitted in the diameter state, and then the lock ring 11 a that is reduced in diameter by opening the tool is fitted in the engagement groove 18. Other parts are the same as those of the first embodiment.

  FIG. 9 shows a first modification of the fitting portion between the opening tube portion 2a and the cover tube portion 5a. In this modified example, the lock ring 11a housed in the annular groove 12a is of an increased diameter, and the lock ring 11a is reduced in diameter by pushing in the push bolt 13a screwed into the bottom of the annular groove 12a. The difference is that it is fitted in the engaging groove 18. Although not shown in the drawings, the lock ring 11a is pushed in by two push bolts 13a at the elliptical long diameter portion. Other parts are the same as those of the second embodiment.

  FIG. 10 shows a second modification of the fitting portion between the opening tube portion 2a and the cover tube portion 5a. In this modified example, the lock ring 11a has a large diameter, and an annular groove 12a for accommodating the lock ring 11a is provided on the outer peripheral surface of the lid cylinder portion 5a, and the lock ring 11a is provided on the inner peripheral surface of the opening cylinder portion 2a. An annular engagement groove 18 into which 11a is fitted is provided, and the space between the separated portions of the lock ring 11a is narrowed by a tool, and the cover cylinder portion 5a is fitted in a state where the diameter of the lock ring 11a is reduced. Thereafter, the lock ring 11a, which expands the diameter by opening the tool, is fitted into the engagement groove 18. Other parts are the same as those of the second embodiment.

  11 and 12 show a third embodiment. The basic structure of the gate valve is the same as that of the first embodiment. As shown in FIG. 11, the lid cylinder part 5 a provided on the lid 5 is the opening cylinder part 2 a of the valve box 2. A seal ring 17 that fits on the inner peripheral side and seals between the valve box 2 and the lid 5 is mounted in a seal groove 16 provided on the inner peripheral surface of the opening cylinder portion 2a.

  In this embodiment, as shown in FIG. 11 and FIGS. 12 (a) and 12 (b), the cross-sections of the opening tube portion 2a and the cover tube portion 5a at the fitting portion are circular, and the outer peripheral surface of the cover tube portion 5a is A plurality of claw portions 19 projecting to the outer diameter side are provided at equal intervals in the circumferential direction, and have an inward direction having a plurality of notches 20a through which the claw portions 19 pass on the inner peripheral surface on the inlet side of the opening cylinder portion 2a. A flange 20 and an arcuate circumferential groove 21 into which each claw portion 19 that passes through the notch 20a fits on the back side of the flange 20 are provided, and after passing the claw portion 19 through the notch 20a, a lid cylinder By rotating the portion 5a relative to the opening cylinder portion 2a, the respective claw portions 19 are axially engaged with the circumferential grooves 21 on the back side of the flange 20, and the side end surfaces 19a on the front side that the respective claw portions 19 are relatively rotated are Pressing against the end surface of the arc-shaped circumferential groove 21, the side end surface 19 b on the rear surface side of the one claw portion 19 is moved from the outer peripheral side of the opening tube portion 2 a. Engaged with the locking pin 22 to be inserted into the arc-shaped circumferential groove 21 is adapted to detent the lid cylindrical portion 5a. Note that the side end surfaces 19 b on the rear surface side of the two or more claw portions 19 may be locked by the locking pins 22. Further, the circumferential groove 21 may be continuous in an annular shape, and the side end surfaces 19 a and 19 b on both sides of the at least one claw portion 19 may be locked by the locking pins 22. Other parts are the same as those of the first embodiment.

  In each of the embodiments described above, the lid tube portion is fitted to the inner peripheral side of the opening tube portion. However, the gate valve according to the present invention fits the lid tube portion to the outer periphery side of the opening tube portion. It can also be.

The longitudinal cross-sectional view which shows the gate valve of 1st Embodiment Sectional view along the line II-II in FIG. Sectional drawing which expands and shows the fitting part of the opening cylinder part and cover cylinder part of FIG. Sectional drawing which shows the modification of the fitting part of the opening cylinder part and cover cylinder part of FIG. a is a cross-sectional view showing a modification of the rotation preventing portion of the lid cylinder portion of FIG. 3, b is a cross-sectional view taken along the line Vb-Vb of a The longitudinal cross-sectional view which shows the gate valve of 2nd Embodiment Sectional drawing along the VII-VII line of FIG. Sectional drawing which expands and shows the fitting part of the opening cylinder part and cover cylinder part of FIG. Sectional drawing which shows the 1st modification of the fitting part of the opening cylinder part and cover cylinder part of FIG. Sectional drawing which shows the 2nd modification of the fitting part of the opening cylinder part and cover cylinder part of FIG. The longitudinal cross-sectional view which shows the gate valve of 3rd Embodiment a and b are sectional views taken along lines XIIa-XIIa and XIIb-XIIb in FIG. 11, respectively. a is a longitudinal sectional view showing a conventional gate valve, b is a sectional view taken along line XIIIb-XIIIb of a a is a longitudinal sectional view showing another conventional gate valve, and b is a sectional view taken along line XIVb-XIVb of a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid passage 2 Valve box 2a Opening cylinder part 3 Valve rod 3a Screw part 3b Handle attaching part 4 Valve body 4a Core metal 4b Rubber lining 5 Lid 5a Lid cylinder part 5b Top part 5c Tip surface 6 Nut member 7 Bush 7a O-ring 8 Bush Presser 9 Annular ridge 9a, 9b Side end face 10 Stepped part 11, 11a Lock ring 12, 12a Annular groove 13, 13a Pushing bolt 14 Engaging groove 14a Standing wall part 15 Protruding part 16 Sealing groove 17 Sealing ring 18 Engaging groove 19 Claw 19a, 19b Side end face 20 鍔 20a Notch 21 Circumferential groove 22 Locking pin

Claims (10)

  A valve box having an opening cylinder portion projecting and opening in a direction perpendicular to the internal fluid passage; and a valve body attached to a valve rod inserted from the opening cylinder portion in a direction perpendicular to the fluid passage and opening and closing the fluid passage; A gate valve that closes the open cylindrical portion of the valve box and allows the valve stem to pass therethrough, and rotates the valve stem to move the valve body in a direction perpendicular to the fluid passage. An axial locking means for forming a lid cylinder portion fitted on the outer peripheral side or inner peripheral side of the opening cylinder portion, and locking the lid cylinder portion fitted in the opening cylinder portion in the axial direction; and a circumferential direction And a sealing member that seals between the valve box and the lid between the peripheral surfaces of the opening cylinder part and the lid cylinder part to be fitted. A gate valve.   2. The gate valve according to claim 1, wherein the seal member is a seal ring mounted in an annular seal groove provided on one of the peripheral surfaces of the opening cylinder part and the lid cylinder part to be fitted.   The outer side which the said axial direction latching means provides the protrusion extended in the circumferential direction in the outer peripheral surface of the inner side cylinder part fitted inside the said opening cylinder part and a cover cylinder part, and is fitted outside On the inner peripheral surface of the cylindrical portion, a stepped portion with a widened inlet side that engages the side end surface on the front side in the fitting direction of the protrusion or the tip surface of the inner cylindrical portion is provided, and the inner side of the stepped portion on the inlet side is provided. An annular groove that houses a lock ring that expands and contracts due to elastic deformation is provided on the peripheral surface, and the side end surface on the front side in the fitting direction of the protrusion or the front end surface of the inner cylindrical portion is locked to the stepped portion, The gate valve according to claim 1 or 2, wherein a diameter of the lock ring is reduced to lock a side end face of the protrusion on the rear side in the fitting direction.   The axial locking means is provided with an annular groove for accommodating a lock ring that expands and contracts due to elastic deformation, on an inner peripheral surface of an outer cylindrical portion that is fitted to the outer side of the opening cylindrical portion and the lid cylindrical portion. An annular engagement groove into which the lock ring is fitted is provided on the outer peripheral surface of the inner cylindrical portion fitted to the inner cylinder, and the lock ring housed in the annular groove is reduced in diameter and fitted into the engagement groove. The gate valve according to claim 1 or 2.   The axial locking means is provided with an annular groove for accommodating a lock ring that expands and contracts by elastic deformation on the outer peripheral surface of the inner cylindrical portion fitted inside the opening cylindrical portion and the lid cylindrical portion, and on the outer side. An annular engagement groove into which the lock ring is fitted is provided on the inner peripheral surface of the outer cylindrical portion to be fitted, and the lock ring accommodated in the annular groove is expanded to be fitted into the engagement groove. The gate valve according to claim 1 or 2.   The anti-rotation means has a circular cross section of the opening cylinder part and the lid cylinder part to be fitted, and radially extends to an end surface of the outer cylinder part fitted to the outside of the opening cylinder part and the lid cylinder part. At least one engaging groove extending is provided, and an outer peripheral surface of the inner cylindrical portion fitted inside is provided with a protruding portion that protrudes outward and fits into the engaging groove. The gate valve according to any one of claims 1 to 5, wherein the gate valve is fitted into a groove.   The said rotation prevention means makes the cross section of the said opening cylinder part and lid cylinder part fitted into the ellipse or ellipse which does not accept | permit these relative rotations. Gate valve.   The axial locking means has a circular cross section of the opening cylinder part and the cover cylinder part to be fitted, and an outer peripheral surface of the inner cylinder part fitted inside the opening cylinder part and the lid cylinder part. A claw portion projecting to the outer diameter side, and an inward ridge having a notch through which the claw portion is passed on the inner peripheral surface on the inlet side of the outer cylinder portion fitted to the outside, and the notch passed therethrough. The claw portion is provided with an arcuate or annular circumferential groove that fits on the back side of the bag, and after passing the claw portion through the notch, the lid tube portion is rotated relative to the opening tube portion, The gate valve according to claim 1 or 2, wherein the claw portion is engaged in an axial direction with a circumferential groove on a back side of the bag.   The rotation preventing means makes the circumferential groove arc-shaped, presses the side end surface of the front side of the claw portion to be rotated relative to the end surface of the arc-shaped circumferential groove, The gate valve according to claim 8, wherein the side end surface is locked by a locking member inserted into the circumferential groove.   The gate valve according to any one of claims 1 to 9, wherein the lid cylinder part is fitted to the inner peripheral side of the opening cylinder part.

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